//
// $Id: ValueExp.java 760 2010-12-09 00:08:58Z samskivert $
//
// Depot library - a Java relational persistence library
// Copyright (C) 2006-2008 Michael Bayne and Pär Winzell
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package com.samskivert.depot.impl.expression;

import java.util.Collection;

import com.samskivert.depot.PersistentRecord;
import com.samskivert.depot.expression.FluentExp;
import com.samskivert.depot.impl.FragmentVisitor;

/**
 * A Java value that is bound as a parameter to the query, e.g. 1 or 'abc'.
 */
public class ValueExp<T> extends FluentExp<T>
{
    public ValueExp (T value)
    {
        _value = value;
    }

    // from SQLFragment
    public Object accept (FragmentVisitor<?> builder)
    {
        return builder.visit(this);
    }

    // from SQLFragment
    public void addClasses (Collection<Class<? extends PersistentRecord>> classSet)
    {
    }

    public T getValue ()
    {
        return _value;
    }

    @Override // from Object
    public String toString ()
    {
        return (_value instanceof Number) ? String.valueOf(_value) : ("'" + _value + "'");
    }

    /** The value to be bound to the SQL parameters. */
    protected T _value;
}
